fox and cornut question

i'm new in foes.lbs near me only sell foes xct 4 with fox rp23 shox.if i want to have this frame with cornut air i have to add $500 and wait 6 weeks to get the shocks.what's really difference in ride between these 2 shox? is it worth for money and time to have the cornut in xct 4 instead of fox? thanks